添加了一个名为speedFactor
的变量。增加它会增加滚动速度,反之亦然。
如果持续时间是恒定的,在向底部滚动时速度会降低。这是因为我们试图在相同的持续时间内覆盖不同的距离,这意味着您的速度必须变化。
所以为了解决这个问题,我正在调整持续时间以保持恒定的速度因子。
double maxExtent = _scrollController.position.maxScrollExtent;
double distanceDifference = maxExtent - _scrollController.offset;
double durationDouble = distanceDifference / speedFactor;
为了停止动画,我只需使用
animateTo
当前的
offset
,这将停止动画,因为我们已经到达了偏移量,没有更多内容可以进行动画。
下面是一个可行的示例。
import 'package:flutter/material.dart'
import 'dart:async'
void main() => runApp(MyApp())
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
)
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState()
}
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
ScrollController _scrollController = ScrollController()
bool scroll = false
int speedFactor = 20
_scroll() {
double maxExtent = _scrollController.position.maxScrollExtent
double distanceDifference = maxExtent - _scrollController.offset
double durationDouble = distanceDifference / speedFactor
_scrollController.animateTo(_scrollController.position.maxScrollExtent,
duration: Duration(seconds: durationDouble.toInt()),
curve: Curves.linear)
}
_toggleScrolling() {
setState(() {
scroll = !scroll
})
if (scroll) {
_scroll()
} else {
_scrollController.animateTo(_scrollController.offset,
duration: Duration(seconds: 1), curve: Curves.linear)
}
}
@override
Widget build(BuildContext context) {
String val = '''
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'''
return Scaffold(
appBar: AppBar(
title: Text('Lyrics'),
),
body: NotificationListener(
onNotification: (notif) {
if (notif is ScrollEndNotification && scroll) {
Timer(Duration(seconds: 1), () {
_scroll()
})
}
return true
},
child: SingleChildScrollView(
controller: _scrollController,
child: Text(
val,
maxLines: 1000,
),
),
),
floatingActionButton: FloatingActionButton(onPressed: () {
_toggleScrolling()
}), // This trailing comma makes auto-formatting nicer for build methods.
)
}
}
更新:添加了代码,使得滚动视图在用户中断后继续滚动。